#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Time       :   16:40
# Author     : Y4
# Site       : 
# File       : 04 函数-默认参数.py
# Software   : PyCharm
def add(a, b=10):
    print(a + b)


add(5)  # 15
add(5, 20)  # 25
